public function testCombineWith()
 {
     $firstArray = [1 => 'one', 2 => 'two', 3 => 'three'];
     $secondArray = ['one' => 1, 1 => 'one', 2 => 2];
     $combinedArray = array_combine($firstArray, $secondArray);
     $ma = new ImmutableArray($firstArray);
     $copiedMa = $ma->combineWith($secondArray);
     $this->assertTrue($copiedMa !== $ma);
     $this->assertTrue($combinedArray === $copiedMa->toArray());
 }
 public function testCombineWith()
 {
     $firstArray = [1 => 'one', 2 => 'two', 3 => 'three'];
     $secondArray = ['one' => 1, 1 => 'one', 2 => 2];
     $arrayzy = new A($firstArray);
     $resultArrayzy = $arrayzy->combineWith($secondArray);
     $resultArray = array_combine($firstArray, $secondArray);
     $this->assertImmutable($arrayzy, $resultArrayzy, $firstArray, $resultArray);
 }